Week 8 - Universal Joint

AIM:

• To perform transient structural analysis on the universal joint with three different materials.
• To obtain results for the simulation.

PROCEDURE:

• Open ansys workbench and dropdown a transient structural analysis system and rename it as a universal joint.
• Browse to the file location and import geometry.
• Open engineering data resources and add stainless steel, titanium alloy, and structural steel.

      

     

     

• Open the model using space claim.

     

• Open ansys mechanical and set up the simulation.
• Delete the automatically created contacts.
• Create the required joints.
• Create a body to ground fixed joint to the spring as below.

     

• Create a body to ground revolute joint as below.

     

• Create another body to ground revolute joint as below.

     

• Create a body to body revolute joints for all the pin joints as below.

     

     

• Now under mesh settings change the element size to 3.5 mm and use no adaptive sizing and change smoothening to medium.

     

     

• The above graph represents mesh metrics which gives a clear idea of element quality and type of elements used for the simulation.

     

• Now under analysis settings change the number of steps to 5.
• Select step-1 to change the weak springs to program-controlled and turn on the large deflection.
• Switch off the auto-time stepping for step-1.
• Change all the output controls to yes.

     

• Select steps 2-5 switch off the auto-time stepping and insert time step as 0.1.

     

• Now select the below shown revolute joint and insert a joint load as rotation in tabular data with increment in the angle of rotation with 30 degrees.

     

     

• Now list the outputs require and simulated the model for results.

CASE-1:

• For case-1 assign material for the model as structural steel and run the simulation to obtain results.

     

CASE-2:

• For case-2 assign material for the model as stainless steel and run the simulation to obtain results.

     

CASE-3:

• For case-3 assign material for the model as titanium alloy and run the simulation to obtain results.

     

RESULTS:

CASE-1: STRUCTURAL STEEL

TOTAL DEFORMATION:

     

EQUIVALENT STRESS:

     

CASE-2: STAINLESS STEEL

TOTAL DEFORMATION:

     

EQUIVALENT STRESS:

     

CASE-3: TITANIUM ALLOY

TOTAL DEFORMATION:

     

EQUIVALENT STRESS:

     

     

SL.NO	MATERIAL	TOTAL DEFORMATION	EQUIVALENT STRESS
1	STRUCTURAL STEEL	38.637 mm	1577.7 MPa
2	STAINLESS STEEL	38.637 mm	1527.6 MPa
3	TITANIUM ALLOY	38.637 mm	774.4 MPa

CONCLUSIONS:

• The double universal joint simulation using three materials that are structural steel, stainless steel, and titanium alloy is completed successfully and results are tabulated.
• The deformation under three cases is the same and the equivalent stress in the case of titanium alloy is less compared to stainless steel and structural steel.
• The design is safe in the case of titanium alloy as the equivalent stress not exceeds the yield strength of the material that is 930 MPa.